1 files changed, 20 insertions, 0 deletions
diff --git a/src/test/ui/underscore-lifetime/dyn-trait-underscore.rs b/src/test/ui/underscore-lifetime/dyn-trait-underscore.rs
new file mode 100644
index 000000000..fa6e65c7d
--- /dev/null
+++ b/src/test/ui/underscore-lifetime/dyn-trait-underscore.rs
@@ -0,0 +1,20 @@
+// Check that the `'_` in `dyn Trait + '_` acts like ordinary elision,
+// and not like an object lifetime default.
+//
+// cc #48468
+
+fn a<T>(items: &[T]) -> Box<dyn Iterator<Item=&T>> {
+    //                      ^^^^^^^^^^^^^^^^^^^^^ bound *here* defaults to `'static`
+    Box::new(items.iter())
+    //~^ ERROR lifetime may not live long enough
+}
+
+fn b<T>(items: &[T]) -> Box<dyn Iterator<Item=&T> + '_> {
+    Box::new(items.iter()) // OK, equivalent to c
+}
+
+fn c<'a, T>(items: &'a [T]) -> Box<dyn Iterator<Item=&'a T> + 'a> {
+    Box::new(items.iter()) // OK, equivalent to b
+}
+
+fn main() { }